A chain conveying structure for preventing the chain from being broken at the end of a chain of spreadable projectiles

Abstract

The application discloses a kind of prevent the chain feeding structure of the last card chain of dispersible bullet chain, can prevent the card chain failure caused by the bullet receiver seat of dispersible bullet chain link drop into.It includes bullet receiver seat, press bullet board, the bottom of bullet receiver seat is equipped with bullet inlet, press bullet board is equipped with bullet pressing protrusion, the bullet pressing protrusion is equipped with bullet positioning arc groove, the chain inlet end of bullet pressing protrusion is guide slope, the bottom surface of the chain inlet end of press bullet board is equipped with eccentric protrusion;When last bullet is on the last bullet chain link, and last bullet chain link is positioned at bullet inlet position, bullet positioning arc groove is connected with the outer circle of last bullet;When last bullet is pushed away by automatic machine, eccentric protrusion generates pressure F to the front end of last bullet chain link, the component force Fx of this pressure F in horizontal direction forces last bullet chain link to move forward.

Description

Technical Field

[0001] This invention relates to the field of light weapons technology, and in particular to a chain structure for preventing jamming at the end of a disintegrating ammunition belt. Background Technology

[0002] Disintegrating belts are characterized by their compact structure and ease of maneuverability, making them a common type of ammunition belt used in machine guns. However, compared to non-disintegrating belts, when the last round is fired (the final shot), the link of the disintegrating belt remains in the machine gun's receiver and cannot be ejected by the ejector mechanism. This link, if subjected to vibration or other factors, has a considerable probability of falling into the receiver, causing a jamming failure and affecting the reliability of the firearm and reloading time.

[0003] The usual approach is to optimize the belt positioning method, using a compression plate to position the last link of the belt and constrain it to the receiver housing. However, this method is sensitive to size and the spring force of the compression plate; incorrect parameters can even have the opposite effect, increasing the probability of the last link jamming. When the receiver cover is opened, the last link of the belt loses its constraint and has a considerable chance of falling into the feed port. Some foreign machine guns also use additional parts to eject the last link from the gun, but this is structurally complex and can affect the reliability of the firearm in extreme environments.

[0004] The existing compression protrusions have short guide ramps and are only set on the compression protrusions. They cannot be pressed against the rear end of the cartridge chain and are only used for compression guidance. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a chain conveying structure to prevent chain jamming at the end of a disintegrating ammunition chain, thereby preventing chain jamming caused by disintegrating ammunition chain links falling into the receiving device seat.

[0006] The objective of this invention is achieved as follows:

[0007] A chain conveying structure for preventing the chain from jamming at the end of a disintegrating ammunition belt includes a receiving device seat and a pressing plate. The bottom of the receiving device seat is provided with an inlet for positioning the ammunition belt. The pressing plate is mounted on the receiving device seat via a pressing plate pivot and a pressing plate spring. The bottom wall of the pressing plate and the receiving device seat forms a chain conveying channel. The bottom surface of the pressing plate at the chain inlet end is provided with a pressing protrusion. The bottom of the pressing protrusion is provided with a bullet positioning arc groove. The chain inlet end of the pressing protrusion is a guide slope. The bottom surface of the pressing plate at the chain inlet end is provided with an eccentric protrusion. The eccentric protrusion is located on one side of the pressing protrusion. There is an eccentric distance between the eccentric protrusion and the center of the bullet positioning arc groove, and the eccentric protrusion is located behind the center of the bullet positioning arc groove.

[0008] When the final bullet is on the link of the final bullet belt and the link of the final bullet belt is positioned at the inlet, the bullet positioning arc groove engages with the outer circle of the final bullet, the front end of the link of the final bullet belt is supported on the receiver seat, and a gap A is left between the eccentric protrusion and the front end of the link of the final bullet belt.

[0009] When the final round is pushed away by the automatic mechanism, the magazine plate loses the support of the final round. Under the spring force of the magazine plate spring, the magazine plate rotates, and the eccentric protrusion contacts the front end of the final round link. The eccentric protrusion generates pressure F on the front end of the final round link. The horizontal component of this pressure F, Fx, forces the final round link to move forward. The front end of the final round link passes over the feed port, so that both ends of the final round link are supported on the receiver seat. The eccentric protrusion prevents the final round link from retracting.

[0010] Preferably, the spring pressure plate includes a front spring pressure plate and a rear spring pressure plate.

[0011] Preferably, the rear end of the magazine plate extends rearward and upward, and this section of the magazine plate is located on the same plane as the guide ramp and connected to form an extended guide ramp. After the final round is pushed away axially by the automatic mechanism, this extended guide ramp presses against the rear end latch of the final round link, preventing the front end latch of the final round link from flipping and falling into the feed port. This prevents accidental flipping during the entire final round link transport process.

[0012] Preferably, the value of gap A is 0.1-0.2 mm.

[0013] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0014] The mechanism restricts the rotation of the ammunition chain and forces the chain links to move a certain distance towards the outlet, ensuring that both ends of the chain links are supported and prevented from falling into the feed port. Both the restriction of chain rotation and the forcing of chain links towards the outlet are achieved by the pressure plate.

[0015] It only requires adding the corresponding structure to the machine gun's own ammunition loading plate, without the need for additional parts, and is characterized by its simple structure and ease of implementation. Attached Figure Description

[0016] Figure 1 This is a common structure of machine gun loading plates. Structures unrelated to this invention are omitted in the figure. 1-Front loading plate, 2-Rear loading plate, 3-Loading plate pivot, 4-Receiver seat, 5-Bullet belt link, 6-Bullet;

[0017] Figure 2 This is a schematic diagram of the principle of the end-of-life chain. For ease of representation, the receiver seat in the diagram has been cut out and the rear pressure plate structure has been hidden. 1-Front pressure plate, 4-Receiver seat, 5-Bullet chain link, 401-Bullet inlet.

[0018] Figure 3 It is a common machine gun magazine structure. The front and rear magazines are generally mirror images of each other. Therefore, the structure of the front magazine will be described first. 101-ammunition positioning arc groove, 102-guide slope.

[0019] Figure 4 This is a schematic diagram of the bullet pressing plate structure of the present invention, 101-bullet positioning arc groove, 102-guided inclined surface, 103-eccentric protrusion;

[0020] Figure 5 This is a schematic diagram of the extreme position of the ammunition belt after the guide ramp is extended. 1-Front pressure plate, 4-Receiver seat, 5-Ammunition belt link, 401-Ammunition inlet;

[0021] Figure 6 This is a schematic diagram of the final bullet being positioned on the receiver base, where 1-front pressure plate, 4-receiver base, 6-final bullet, 103-eccentric protrusion, 501-final bullet link, and 502-second to last bullet link.

[0022] Figure 7 yes Figure 6 The enlarged view at position I in the middle is used to show the positioning of the ammunition belt on the receiving device. 4-receiving device, 6-final bullet, 501-final ammunition belt link;

[0023] Figure 8 yes Figure 6 Enlarged view of position II: 1-front pressure plate, 103-eccentric protrusion, 501-final ammunition link, A-gap between eccentric protrusion and ammunition link.

[0024] Figure 9 This is a force diagram of the link in the final firing belt at the moment the bullet is ejected. 1-Front pressure plate, 4-Bullet receiver seat, 103-Eccentric protrusion, 501-Link in the final firing belt, F-The pressure exerted by the pressure plate on the link in the belt, Fx-The horizontal component of F.

[0025] Figure 10 This is a schematic diagram of the extreme position of the ammunition belt after it is forced to move towards the inlet by the ammunition pressure plate. 1-Front pressure plate, 4-Receiver seat, 401-Inlet, 501-Terminal ammunition belt link. Detailed Implementation

[0026] The invention will be further described below with reference to the accompanying drawings.

[0027] A magazine catcher is a common feature in most machine guns. It is typically mounted on the receiver cover and can rotate within a certain range around an axis. Magazine catchers generally consist of two parts, front and rear, which respectively position the front and rear ends of the cartridge cone. A magazine catcher spring is usually placed above the magazine catcher to provide downward pressure. Figure 1As shown. The structure of the spring pressure plate is generally as follows: Figure 3 As shown, the guide slope 102 is located near the feed port (left side of the figure), which facilitates the ammunition belt (the ammunition belt links and the bullets are combined to form an ammunition belt) to push open the press plate and enter the bullet positioning arc groove 101, where the ammunition belt is reliably positioned at the feed port under the action of spring force.

[0028] After the final round is pushed away by the automatic mechanism, the final round link 501 remaining on the receiver 4 may lose support on one side due to vibration or other reasons, flip over and fall into the feed port, forming a situation like... Figure 2 As shown in the diagram, the chain links block the movement path of the automaton, causing a chain jam.

[0029] See Figures 4-10 This is a feed structure designed to prevent jamming at the end of a disintegrating ammunition belt. An eccentric protrusion is arranged on the feed plate. When a cartridge is on the belt link, this protrusion does not contact the belt, avoiding interference with the cartridge's positioning. When the cartridge is pushed away by the automatic mechanism, the protrusion comes into contact with the belt. Due to the eccentricity, the protrusion shifts the belt towards the output end by an eccentric distance, preventing the belt from falling into the feed port and thus avoiding jamming at the end of the firing chain.

[0030] This invention first requires extending the guide ramp 102 structure; both the front and rear spring pressure plates need to be extended. Since the structures are identical, the front spring pressure plate will be used as an example for illustration. The extended spring pressure plate is as follows: Figure 4 As shown. When the guiding ramp is lengthened, the extreme position of the spring belt is as follows. Figure 5 As shown. After the bullet is pushed away, due to the restriction of the guiding ramp, the links of the bullet belt cannot move along... Figure 2 The direction of the arrow shown is rotated to prevent the spring chain from forming. Figure 2 The posture shown is important. It's crucial that the length of the ramp matches the height of the feed channel; an excessively long ramp will affect the feed channel's height and cause other problems.

[0031] The second requirement of this method is to add an eccentric protrusion 103 (the eccentricity refers to the deviation from the center of the bullet positioning arc groove) to the loading plate at the position corresponding to the ammunition belt. This structure needs to be added to both the front and rear loading plates. Since the structures are exactly the same, only the front loading plate will be used as an example here. The structure of the loading plate is as follows: Figure 4 As shown. Additionally, the positioning of the ammunition belt at the feed port, closer to the output port (the right side shown in the diagram, i.e., the front end of the belt supported on the receiver), should be designed to be positioned by the cartridge. For example... Figure 6 , Figure 7 As shown. In this position, the ammunition belt must be above the receiving chamber so that it can move smoothly towards the exit outlet (to the right of the diagram) after the bullet is pushed away.

[0032] After the ammunition belt is positioned, the cartridge positioning arc groove contacts the cartridge, and the eccentric protrusion should not contact the belt links. Figure 8 As shown. There should be a gap of 0.1-0.2 mm at position A to prevent the eccentric protrusion from affecting the bullet positioning.

[0033] The moment the cartridge is pushed away by the automatic mechanism, the magazine plate loses the support of the cartridge and rotates downward under the force of the spring. The eccentric protrusion contacts the link of the cartridge belt, generating pressure F. The horizontal component of this pressure F, Fx, forces the cartridge belt to move to the right towards the exit of the chain. Figure 9 As shown.

[0034] The spring chain links eventually form as follows Figure 10 As shown in the diagram, the ammunition belt has already crossed the feed port. The eccentric protrusion prevents the belt from retracting (moving to the left as shown in the diagram), and the guide ramp prevents the belt from advancing further. Therefore, there is no possibility of it falling back into the feed port, thus avoiding the problem of the belt jamming at the end of the firing cycle. Because the link of the final firing cycle is straddling the feed port, the belt is also less likely to fall into the feed port when the receiver cover is opened.

[0035] Invention point:

[0036] 1. The feed direction of the bullet pressure plate is designed with an extended inclined surface to limit the overturning of the bullet belt.

[0037] 2. An eccentric protrusion is placed on the pressure plate.

[0038] 3. The ammunition belt is positioned by the bullet on the side of the chain outlet on the receiving device seat.

[0039] 4. When the magazine plate presses down on the bullet, the eccentric protrusion does not contact the link of the ammunition belt. After the bullet is pushed away, the eccentric protrusion contacts the link of the ammunition belt, squeezing the ammunition belt towards the outlet and forcing it to move a certain distance.

[0040] 5. The ammunition belt is positioned across the feed port, and the eccentric protrusion prevents the belt links from retracting, thus preventing the belt links from falling into the feed port and preventing the belt from jamming at the end of the shot.

[0041] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A chain conveying structure for preventing jamming at the end of a disintegrating ammunition belt, comprising a receiving device seat and a pressing plate, wherein the bottom of the receiving device seat is provided with an inlet for positioning the ammunition belt, the pressing plate is mounted on the receiving device seat via a pressing plate pivot and a pressing plate spring, the space between the pressing plate and the bottom wall of the receiving device seat forms a chain conveying channel, the bottom surface of the pressing plate at the chain inlet end is provided with a pressing protrusion, the bottom of the pressing protrusion is provided with a bullet positioning arc groove, and the chain inlet end of the pressing protrusion is a guide slope, characterized in that: The bottom surface of the feed chain end of the press plate is provided with an eccentric protrusion. The eccentric protrusion is located on one side of the press protrusion. There is an eccentric distance between the eccentric protrusion and the center of the bullet positioning arc groove. The eccentric protrusion is located behind the center of the bullet positioning arc groove. When the final bullet is on the link of the final bullet belt and the link of the final bullet belt is positioned at the inlet, the bullet positioning arc groove engages with the outer circle of the final bullet, the front end of the link of the final bullet belt is supported on the receiver seat, and a gap A is left between the eccentric protrusion and the front end of the link of the final bullet belt. When the final round is pushed away by the automatic mechanism, the magazine plate loses the support of the final round. Under the spring force of the magazine plate spring, the magazine plate rotates. The eccentric protrusion contacts the front end of the magazine link. The eccentric protrusion generates pressure F on the front end of the magazine link. The horizontal component of this pressure F, Fx, forces the magazine link to move forward. The front end of the magazine link passes over the feed port, so that both ends of the magazine link are supported on the receiver seat. The eccentric protrusion prevents the magazine link from retracting. The rear end of the magazine plate extends backward and upward. This section of the magazine plate is on the same plane as the guide ramp and is connected to form an extended guide ramp. After the final round is pushed away axially by the automatic mechanism, the extended guide ramp presses against the rear end latch of the final round link, preventing the front end latch of the final round link from flipping and falling into the feed port.

2. The chain conveyor structure for preventing the end of a disintegrating chain from jamming, as described in claim 1, is characterized in that: The spring pressure plate includes a front spring pressure plate and a rear spring pressure plate.

3. The chain conveyor structure for preventing the end of a disintegrating chain from jamming, as described in claim 1, is characterized in that: The value of gap A is 0.1-0.2 mm.

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